片段替换未在Android中

Question

使用ChildFragmentManager时工作，我想作为一个孩子添加一个片段到另一个片段
我使用ChildFragmentManager

这是我ChildFragmentManagerActivity.java
ChildFragment.java
ParentFragment.java
其布局如下
activity_childfragmentmanager.xml
layout_parentfragment.xml
layout_childfragment.xml

我能够加入ParentFragment成功。请检查下面的图片

但是当我尝试添加ChildFragment，则出现如下

我想通过替换被添加的子片段内容前面的布局
在前提前

Answer 1

事务不会删除将用于事务的容器中已存在的视图。要删除这些视图，您需要将ParentFragment的初始内容作为片段进行换行，并用子片段替换（使用replace事务而不是add事务）。我做了一些修改你的代码，看看下面：

ParentFragment：

public class ParentFragment extends Fragment { 

private static final int CONTAINER_ID = 0x2222; 
private static final String INITIAL_FRAG = "initial_fragment"; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    FrameLayout wrapper = new FrameLayout(getActivity()); 
    wrapper.setId(CONTAINER_ID); 
    // look for our two possible fragments, if we don't find the 
    // InitialContentFragment add it 
    if (getChildFragmentManager().findFragmentByTag(INITIAL_FRAG) == null) { 
     InitialContentFragment initContent = new InitialContentFragment(); 
     Bundle args = new Bundle(); 
     args.putString("text", 
       "I'm the initial content fragment in the parent fragment"); 
     initContent.setArguments(args); 
     getChildFragmentManager().beginTransaction() 
       .add(CONTAINER_ID, initContent, INITIAL_FRAG).commit(); 
    } 
    return wrapper; 
} 

public void requestFragmentTransaction() { 
    FragmentTransaction fragmentTransaction = getChildFragmentManager() 
      .beginTransaction(); 
    ChildFragment childFragment = new ChildFragment(); 
    Bundle args = new Bundle(); 
    args.putString("text", "Hi I am Child Fragment"); 
    childFragment.setArguments(args); 
    fragmentTransaction.replace(CONTAINER_ID, childFragment, "ChildFragment"); 
    fragmentTransaction.addToBackStack(null); 
    fragmentTransaction.commit(); 

} 

}

其中InitialContentFragment是：

public static class InitialContentFragment extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     // inflate the layout file that would normally be in the 
     // ParentFragment at start 
     View view = inflater.inflate(R.layout.layout_parentfragment, 
       container, false); 
     Bundle bundle = getArguments(); 
     final String text = bundle.getString("text"); 
     TextView textView = (TextView) view.findViewById(R.id.textView1); 
     textView.setText(text); 
     Button button = (Button) view.findViewById(R.id.button1); 
     button.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       ParentFragment parent = (ParentFragment) InitialContentFragment.this 
         .getParentFragment(); 
       parent.requestFragmentTransaction(); 
      } 
     }); 
     return view; 
    } 
} 

作为一个侧面说明，不要像你那样忽略try-catch块。